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Pythagoras' theorem relates the three sides of a right-angled triangle and is one of the most practical geometry topics at GCSE. It is used in 2D and 3D problems, coordinate geometry, and combined with trigonometry at higher tier.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Adding all three sides squared instead of only the two shorter sides
Forgetting to square root the final answer
Applying Pythagoras to a triangle that is not right-angled
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Trigonometry uses sine, cosine and tangent ratios to find missing sides and angles in right-angled triangles. Higher-tier students extend this to non-right-angled triangles using the sine rule, cosine rule, and area formula.
NumberSurds are irrational numbers left in root form and tested exclusively at higher tier. Students must simplify, add, subtract, multiply and rationalise surds, skills that also prepare them for A-Level mathematics.
Geometry & MeasuresVolume and surface area questions range from simple prisms at foundation to cones, spheres and frustums at higher tier. Students must choose the correct formula, substitute values carefully, and give answers to appropriate accuracy.
Everything you need to know about revising for GCSE Maths in 2026. From building a revision schedule to mastering every topic area, this comprehensive guide covers exam structure, study strategies, and expert tips to maximise your grade.
Online LearningDiscover online maths games that make learning advanced concepts fun and accessible. From algebra puzzles to geometry challenges, these games build real skills without students even realising it.
Exam PreparationA clear guide to the differences between GCSE Maths Foundation and Higher tiers. Understand grade ranges, content differences, and how to make the right choice for your child's target grade and confidence level.
Take our free diagnostic quiz to find out exactly where you stand, then get matched with a tutor who specialises in geometry & measures.